Park Ridge, Ill. -
The Big Ten Conference announced the winners of the weekly field hockey awards on Monday. Northwestern's Chelsea Armstrong won Offensive Player of the Week, Penn State's Ayla Halus won Defensive Player of the Week, and Michigan's Rachael Mack earned Freshman of the Week accolades.

Northwestern's Chelsea Armstrong claimed her third Offensive Player of the Week honor of the season and sixth of her career after helping Northwestern to two victories last weekend, beginning with her four-goal, one-assist effort in a 5-0 win over UC Davis, tying her career highs with four goals and nine points in a single game. In conference play, Armstrong scored two first-half goals to help the Wildcats to their first 2-0 start in the Big Ten since 1994. The Perth, Australia, native now ranks sixth all-time at Northwestern in both points and goals.

Last Northwestern Offensive Player of the Week: Chelsea Armstrong (Sep. 25, 2010)

Ayla Halus was the driving force behind No. 16 Penn State's 4-1 road victory against No. 7 Michigan State on Friday. Halus limited the Spartans to just one goal with her performance in the cage. During the game, she faced 10 shots on goal and saved nine. The victory marked her fourth contest of the year with at least nine saves and the eighth in which she allowed one goal or less.

Last Penn State Defensive Player of the Week: Ayla Halus (Sep. 20, 2010)

Mack wins the fourth weekly award of her career after helping the No. 14 Wolverines to a pair of victories this past weekend against Miami (Fla.) and Iowa. The Bromsgrove, England, native recorded her first career game-winning goal in helping Michigan to a 4-3 overtime win over the Hurricanes on Oct. 8. Mack assisted Michelle Roberts in the 23rd minute to give the Wolverines a 2-1 lead. She then scored on a direct corner from Paige Laytos and Katie Adams to make it 3-1. Miami scored twice in the second half to send the game into overtime, where Mack would end it with just 55 seconds remaining in the extra session. Mack now has nine goals on the season and 20 points, which leads the team.